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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <input type="checkbox">敲代码
    <input type="checkbox" checked>睡觉
    <input type="checkbox" checked>吃饭
    <input type="checkbox">打豆豆
</body>

</html>